On April 5, 1981, a 30-year-old Saensak Muangsurin (14-5, 11 KOs) and Chung-Jae Hwang met in the ring in a welterweight bout.
Muangsurin came in to the fight on a 1-fight losing streak with a 57% KO rate, and was fighting after a gap of 4 months and 23 days.
Saensak Muangsurin lost to Chung-Jae Hwang via majority decision in the 12-round welterweight fight, and adds an loss to his record at 14-6.
On November 13, 1980, a 30-year-old Saensak Muangsurin (14-4, 11 KOs) and Andoni Amana met in the ring.
Muangsurin came in to the fight on a 1-fight win streak with a 61% KO rate, and was fighting after a gap of 1 month and 14 days.
Saensak Muangsurin lost to Andoni Amana via unanimous decision in the 10-round fight, and adds an loss to his record at 14-5.
On October 18, 1979, a 29-year-old Saensak Muangsurin (13-3, 10 KOs) and a 21-year-old American boxer Thomas Hearns (22-0, 21 KOs) met in the ring.
Muangsurin came in to the fight on a 2-fight losing streak with a 62% KO rate, and was fighting after a gap of 2 months and 28 days. Hearns was on a 22-fight win streak with a 95% KO rate, and fighting after a layoff of 26 days.
Thomas Hearns stopped Saensak Muangsurin via TKO in the 3rd round. Hearns improves his record to 23-0 (22 KOs), while Muangsurin adds a loss to his record at 13-4.
On July 20, 1979, a 28-year-old Saensak Muangsurin (13-2, 10 KOs) and Dan DeGuzman met in the ring.
Muangsurin came in to the fight on a 1-fight losing streak with a 66% KO rate, and was fighting after a gap of 6 months and 20 days.
Saensak Muangsurin lost to Dan DeGuzman via split decision in the 10-round fight, and adds an loss to his record at 13-3.
On December 30, 1978, the 28-year-old WBC super-lightweight world champion, Saensak Muangsurin (13-1, 10 KOs), faced Sang-Hyun Kim, in a title defense fight.
Muangsurin came in to the fight on a 8-fight win streak with a 71% KO rate, and was fighting after a gap of 8 months and 22 days.
Saensak Muangsurin was defending his super-lightweight WBC titles against Sang-Hyun Kim and lost via TKO in the 13th round, and adds an loss to his record at 13-2.
On June 30, 1976, the 25-year-old WBC super-lightweight world champion, Saensak Muangsurin (5-0, 4 KOs), faced Miguel Velasquez, in a title defense fight.
Muangsurin came in to the fight on a 5-fight win streak with a 80% KO rate, and was fighting after a gap of 5 months and 5 days.
Saensak Muangsurin was defending his super-lightweight WBC titles against Miguel Velasquez and lost via disqualification in the 15-round super-lightweight fight, and adds an loss to his record at 5-1.